U.S. senate candidates debate at KPBS

The top five candidates running to replace retiring U.S. Sen. Barbara Boxer, from left, Duf Sundheim, Kamala Harris, Loretta Sanchez, Ron Unz, and Tom Del Beccaro, stand on stage as they debate on live television, radio, and internet at KPBS in San Diego.

Hayne Palmour IV / San Diego Union-Tribune

The top five candidates running to replace retiring U.S. Sen. Barbara Boxer, from left, Duf Sundheim, Kamala Harris, Loretta Sanchez, Ron Unz, and Tom Del Beccaro, stand on stage as they debate on live television, radio, and internet at KPBS in San Diego.

The top five candidates running to replace retiring U.S. Sen. Barbara Boxer, from left, Duf Sundheim, Kamala Harris, Loretta Sanchez, Ron Unz, and Tom Del Beccaro, stand on stage as they debate on live television, radio, and internet at KPBS in San Diego. (Hayne Palmour IV / San Diego Union-Tribune)

California Attorney General Kamala Harris, center, shakes hands with U.S. Representative Loretta Sanchez as they, Ron Unz, right, and the other two top candidates running to replace retiring U.S. Sen. Barbara Boxer, walk on stage before they debate.

Hayne Palmour IV / San Diego Union-Tribune

California Attorney General Kamala Harris, center, shakes hands with U.S. Representative Loretta Sanchez as they, Ron Unz, right, and the other two top candidates running to replace retiring U.S. Sen. Barbara Boxer, walk on stage before they debate.

California Attorney General Kamala Harris, center, shakes hands with U.S. Representative Loretta Sanchez as they, Ron Unz, right, and the other two top candidates running to replace retiring U.S. Sen. Barbara Boxer, walk on stage before they debate. (Hayne Palmour IV / San Diego Union-Tribune)